I feel like they're missing your question. Yes you can run homebrew through devmode including SMALL emulators. No it will not lead to an actual exploit because devmode is sandboxed.
What I mean by homebrew is you can create an app that says hello world. Not an app that has access to anything related to the system. UWP is like... the best way to describe it is your not touching the target platform with a 50ft pole.